Get a list of Observation objects.

### Available end points:

- `/observations/` - Will list all Results in the database
- `/observations.json` - Will return all Results in json format. This can
also be achieved by using the accept header. `application/json`
- `/observations/<object_id>/` - Returns Results object with that id

### Available Methods:

- `GET`
- `HEAD`

### Available filters:

- `title`
- `uuid`
- `keywords`
- `status`
- `result_field`
- `discoveryKeywords`
- `updateFrequency`
- `nonGeographicFlag`
- `publicationState`
- `permissions`

### How to use filters:

These filters can be used like django query filters using __ for related model relationships.

- `/observations/?uuid=d594d53df2612bbd89c2e0e770b5c1a0`
- `/observations/?status=completed`
- `/observations/?results_field__dataPath__startswith=/neodc/esacci`
- `/observations/?discoveryKeywords__name=ESACCI`
- `/observations/?nonGeographicFlag=True`

Filters can be stacked to build an 'AND' relationship. E.g.

- `/observations/?publicationState__in=published,citable&nonGeographicFlag=True`
- `/observations/?publicationState__in=published,citable&discoveryKeyword__name=NDGO0003`

GET /api/v2/observations/705/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 705,
    "uuid": "97f11faf981b8fd63ae3a8886ca5d284",
    "title": "Greenland Flow Distortion EXperiment (GFDex): Met Office forecast products",
    "abstract": "The Greenland Flow Distortion EXperiment investigates the role of Greenland in defining the structure and the predictability of both local and downstream weather systems, through a programme of aircraft-based observation and numerical modelling. The Greenland Flow Distortion Experiment (GFDex) will provide some of the first detailed in situ observations of the intense atmospheric forcing events that are thought to be important in modifying the ocean in this area (but are presently poorly understood): namely tip jets, barrier winds and mesoscale cyclones. The dataset contains Met Office forecast products.",
    "keywords": "GFDex, UM ",
    "publicationState": "published",
    "dataPublishedTime": "2007-03-28T11:03:40",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/706/?format=api",
        "dataPath": "/badc/gfdex/data/ukmo-plots",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 7782989554,
        "numberOfFiles": 3346,
        "fileFormat": "Images are PNG formatted"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/200/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/8/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [],
    "dataLineage": "Remote and in situ measurements, and data collected onboard the Facility for Airborne Atmospheric Measurements (FAAM) Bae-146 aircraft are available through the GFDex archive at the BADC. Forecast predictions from the Met Office and High Resolution Limited Area Model (HIRLAM) are also stored.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/456/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/643/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/640/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/2005/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/2010/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/2007/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/2008/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/2009/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/2011/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/2004/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/2006/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": "https://api.catalogue.ceda.ac.uk/api/v2/computations/707/?format=api",
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2526/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}